Purpura, petechiae, ecchymoses

In line with the previous post, what is actually purpura? What about petechiae? And ecchymoses?Different from those non-purpuric rash, the purpuric rash usually DO NOT blanch with pressure.One of the ways to perform blanching is by the glass test. The picture shown is taken from this article - click here for the article. Click on the image to go to its image location.Depending on their size,